Malicious PDF — malware analysis report

Static analysis result for SHA-256 5340ef66142faddf…

MALICIOUS

PDF

34.8 KB Created: 2020-10-16 04:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 6bd536d649b18d217fd63a472aa9c6ef SHA-1: fa553067ca8bc0b3c309d3da89a0cb0059fb03ac SHA-256: 5340ef66142faddf194d9da306a01ad6c3586fc5ea5747e2f6f9a05308e06543
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/pify?keyword=cursive+writing+book+for+class+1+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369930/normal_5f88d0f46c499.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366359/normal_5f87f81093a0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366004/normal_5f88da6496ce7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5f880f58334b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369331/normal_5f87ba417455e.pdfIn PDF document text
    • https://site-1041387.mozfiles.com/files/1041387/82494611544.pdfIn PDF document text
    • https://site-1036932.mozfiles.com/files/1036932/vawadotopebid.pdfIn PDF document text
    • https://site-1038720.mozfiles.com/files/1038720/85558998882.pdfIn PDF document text
    • https://site-1048550.mozfiles.com/files/1048550/63858479283.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4662380e-5dc2-47e4-a333-e54a19648639/4950035405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f96af5f-565e-4b87-92a2-32812e8b4697/petuxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/7614/4292/files/1998_toyota_tacoma_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/3346/4479/files/veteboxififezoxig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/8796/9438/files/63688990073.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7366/9782/files/pimazuximoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2557/8159/files/libro_de_ortopedia_infantil_rosselli.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/9279/6073/files/cambridge_igcse_computer_science_revision_guide_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6131/6257/files/funomubusilu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000049b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49B9 5636 bytes
SHA-256: 5c5a310bc973a00d6f2fdc426da38df8ef335a9506f7d727521f4865527e5d43
font_01_sfnt_off00005d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D0E 9684 bytes
SHA-256: 9b3aaff497e8364c2142d78076c38f0061a0331d0658f9808d750a978e8e471d